A diamond brooch, late 18th Century, possibly Portuguese

Designed as a bow with an articulated pendent tassel, set with cushion-shaped, circular- and single-cut, and oval diamonds, later brooch pin to reverse.

Cf: E. Steingräber, ‘Antique Jewellery’, London 1957, page 155 for a similar example of this jewel.

Mounted in gold and silver. Total diamond weight approximately 7.50-8.50 carats, mixed colours and clarities, diamond bright and lively with some chips and abrasions. Scratches to mount consistent with age and evidence or recent repolish. Later brooch pin to reverse. Additional pendant fitting. In good condition.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Please note that colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's. We do not guarantee, and are not responsible for any certificate from a gemological laboratory that may accompany the property. We do not guarantee that watches are in working order. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue, in particular to the Notice regarding the treatment and condition of gemstones and to the Notice regarding import of Burmese jadeite and rubies into the US.
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A similar example of this jewel can be seen in the Victoria and Albert Museum.